Lock mechanism



Nov. 14, 1933. A MA|N 1,934,938

LOCK MECHANISM Filed July` 25l 1930 0 ZZ@ 4f INVENTOR ATTORNEYs yPatented Nov. 14, 1933 f mesne assignments, to Cleveland FareBox and Four-Way Lockv o.', Cleveland, Ohio, a corfporation ofV Ohio Application Juiylz's, 1930. serial No. 470,578. ccliii'ms.fr (cipro- 446)Y This 'invention relates to locksjand more par-Y y ticularly tojlocks4 of therotary plug and cylinder ',tyr'ie".Vlr "Ona objectof the invention is to provide such ai lock adapted'for actuatingV a sliding bolt "and soarra'nged that full boltmovement in either direction requires full 360 .rotationv of the plug,

making itpossibleto require insertion or removalV of the keyfinjone position only.' fAnother object is generally to improve the plugjand' cylinder mechanism in a manner to simplify :and strengthenl the sameand also' totake the driving effect of g the. key away from its wardsfor protecting the latter. Q W j,

- Further objects of the vinvention are in part obvious. and in part will appear more in detail hereinafter.

In the drawing, which represents one suitable embodiment ofthe invention, Fig. 1 is a plan View; Fig. v2 is a similar view with the" cover and attached parts removed; Fig. 3 is a sectional elevation on the line 33, Fig. 1; Fig. 4 is a cross section ony the line 4--4,` Fig. 2; Fig. 5 is an elevatin ofthe key; and Fig. 6v isa section on theline 6 6, Fig. 3. The lock shown in the drawing is designed particularly for prison use, such as on solitary confinement cells, although it maybe used for many other purposes. It comprises a base plate or body 1 which may be a simple metal plate or castingfastened to a suitable support. For ex ample, in prison use it may be welded permanently along its edges to a metal plate of cell wall or door. Said plate carries the operatingparts of the lock mechanism, which is housed in a casing 2 attached to plate 1 and includes a slidingbolt 3 having its locking portion `guided in an opening in the casing wall, saidibolt also having an elongated guiding slot or opening 4 through which extend the plug operated rotatable lock parts, comprising a connector 5 of sleeve form countersunk to receive a support, such as a disc like boss` 1a of the plate .1, upon which the connector ro- Y tates. Said connector also is provided with an upper cylindrical recess 6 intowhich extends the recess in the bolt. Fig. 2 shows these parts in lock released position, with the arm 11 against a shoulder 13`and entending` longitudinally of the bolt, so that the end of said arm formsa positive abutmentv for surface 14`to prevent 'bolt'ino'vement. Inthrowing the bolt to locked position. 0

arm 11' is turned counterclockwise 180, first engaging an abutment'12 in the position shown in dottedlines and then cammingthe bolt to locked position'until arm r11 engages the other shoulder The key for this lock is of special form, as will y be described, making it highly desirable to comfpel an operator of thelock to always insert or remove the key in one position, and becausev the key mustfbe turned to move the throwing arm it is clear that this'desirable operation requires 360 rotation 'of `the key. The driving" connections from key to throwing arm therefore include a suitable lost -motion connection so that 360 key rotation produces only 180 rotation ofthe rollback member 10.: In the arrangement'shown this lost motion connection is introduced between' the connector 5 and the roll back 10.A The former is provided with a projection 15V which turns or, more accurately, reciprocates back and forth in a recess 16 between two stop shoulders 17 of member 10. Therefore, assuming the parts in the. position in Fig. 2 and thatrit is desired to throw rthe bolt to locked position, the connector is turned counterclockwise by the plug, the latter being operated-by the key, as will appear. The first 180 of movement of the connector, during which the lug 15 moves from one shoulder 17 to the other, is an idle movement, without ef` fect upon the roll back member, but the second 180 of its movementv turns the roll back and f throws the bolt. This action occurs in both directions of rotation from full locked to full re lease position and vice versa.

Thev casing or cover 2 carries a sleeve portion 18 into which is threaded a cylinder or barrel 19 in which rotates the plug 7 before referred to, said plug and cylinder being in general of the form and construction shown and described in my prior applicationfor cylinder lock, led October 1'7, 1929, Ser. No. 400,270, to which reference may be had for details not here described. The plug is provided with acruciform key way or slot 20 for a key 20a having a warded portion of like cross section and Awhose wards actuate tumbler levers 21 cooperatingwith longitudinal grooves 22 of the cylinder. The plug is made of two parts, a body 23 and a capy 24, the body being of cylindrical form carrying the integral driver 8 at one end and its tumbler slots being formed by two transverse diametrical saw slots 25 extending from its outer end toward the driver 8 at its inner end, thereby forming four quadrant shaped segments 26 integrally connected only at onef end. The cap 24 is countersunk and sleeved over reduced end portions of said segments with a driving t and is preferably rigidly secured in any suitable manner to each one thereof, such as by a countersunk set screw 2'?.

Said cap also is provided with a non-circular', such as square, socket 28 to receive a like shaped portion 29 of the shank of' the key when the latter is fully inserted into the keyway in the plug..

With this arrangement, when the key is pushed fully home,`the tumblers are entirely withdrawn within the plug, which is therefore free to rotate in its cylinder. Also the driving part 29 of the key shank is in the socket 28. Therefore turning movement applied to thekey is imparted to the cap and is distributed directly and equally toeach of the segments 26. The cap 24 therefore not only tends to anchor the four segments immovably relative to each other, but also insuresequal distribution of tuning movement between them and' preventsany possibility of bending or flexing of an individual segments, which might bind or otherwise interfere with the action of the tumbler levers housed between them.

AsV stated the cylinder 19 is. threaded intoy the sleeve 18. When screwed home it may be anchored non-rotatably by one or more screws 30 threaded through its ange into rthe sleeve, the heads of such screws being countersu-nk in recesses 31 which are then lled with small brass plugs 31a which are ground off ush, and which must be bored out toopen the lock. The plug `is conn-ned by a washer 32 which may be a driving fit or-may be doweledintothe cylinder as by the pins 33, and` which washer has a single gateway 34 for a lateral lug 29a on the key compelling introduction or removal of `the key in only one position. As a result, the proper wards of the key always are registered with the proper grooves of the cruciform key slot of the plug.

Of course a lock of this kind is usually applied to that side of a door which is out of reach of the prisoner, to prevent his tampering with its parts.

What I claim is:

1. Lock mechanism of the character described, comprising a casing, a locking member movable to locked and unlocked positions, and actuating mea-nstherefor, including relatively rotatable cylinder and plug members, means for securing said cylinderA against rotation relative to said casing., said plug'member having four quadrant portions -separated by crossed diametrical slots to form a cruciform key Way, tumbler members in said plug, recesses in said cylinder adapted to receive said tumbler members, and a cap embracing the free ends of the quadrant portions of said plug. and attached thereto, saidA cap-being provided with a non-circular. driving socket of crossy section other than cruciform, whereby the quadrant portions of the plug and said cap are adapted to'be separately driven by cruciform and non-cruciform portions ofV a key.

' 2. Lockmechanism of thercharacter described, comprising a chambered casing having two opposite walls,the exposed wall being provided With an opening and the other wall with a support opposite said opening, a connector rotatable upon said support', relatively rotatable cylinder and plug membersV insertable into said chamber through said opening, a driving connection between said plug member and connector-and attachable and detachable by endwise` plug movement, a roll-back member surrounding the cylinder member and overlying and conning the connector upon its support, means for securing the cylindermember in the casing, and a locking member in the chamber of said casing actuated by saidroll-back member.

ANDREW MAIN. 

